US4588011A - Tire-demounting device - Google Patents

Tire-demounting device Download PDF

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Publication number
US4588011A
US4588011A US06/697,229 US69722985A US4588011A US 4588011 A US4588011 A US 4588011A US 69722985 A US69722985 A US 69722985A US 4588011 A US4588011 A US 4588011A
Authority
US
United States
Prior art keywords
bead
tire
breaking
set forth
pincers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/697,229
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English (en)
Inventor
Eickhart Goebel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEBR HOFMANN Co KG GmbH
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to GEBR. HOFMANN GMBH, CO. KG reassignment GEBR. HOFMANN GMBH, CO. KG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GOEBEL, EICKHART
Application granted granted Critical
Publication of US4588011A publication Critical patent/US4588011A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
    • B60C25/01—Apparatus or tools adapted for mounting, removing or inspecting tyres for removing tyres from or mounting tyres on wheels
    • B60C25/02—Tyre levers or the like, e.g. hand-held

Definitions

  • the invention relates generally to manual tire-demounting devices.
  • Conventional tire-mounting machines are not suited to demount a tire from this type of new tire/rim assembly. Because this new tire/rim assembly is becoming more widely accepted, there is a need for a device for demounting the tire from the rim.
  • the present invention is directed toward filling that need.
  • the present invention is directed to a tire-demounting apparatus for demounting a tire from a rim in a tire/rim assembly where the bead of the tire extends over the rim and is located behind the rim flanges which are bent radially inwards.
  • the apparatus basically comprises a pair of pincers in the form of first and second elongated arms joined at one end by a pincer pivot.
  • a first bead-breaking element also is pivotally mounted near the pincer pivot.
  • a second bead-breaking element also is pivotally mounted near the pincer pivot.
  • the first and second bead-breaking elements are mounted through first and second pivots. The first and second pivots are at different distances from the pincer pivot so that, when the first arm is pivoted relative to the second arm, the first bead-breaking element exerts a force component on the bead of the tire which is substantially radial relative to the tire.
  • the second bead-breaking element exerts a force component which is substantially axial relative to the tire.
  • the tire bead-breaking elements are pivoted on the upper lever at different distances relative to the pivot of the pincers, the tire bead is first pulled radially inwards by means of one bead-breaking element and then axially over the rim flange by means of the second bead-breaking element.
  • one of the bead-breaking elements is fork shaped, the other can be applied to the tire bead in between the two prongs of the first one.
  • FIG. 1 is a perspective view of an embodiment of the demounting device incorporating the teachings of the present invention and showing a tire in phantom.
  • FIG. 2 is a side view, partly in section, showing application of the demounting device to a wheel including a rim and a tire.
  • FIG. 3 is similar to FIG. 2 and illustrates the initial position of the demounting device for bead-breaking.
  • FIG. 4 is a side view, partly in section, of the demounting device during the first phase of the bead-breaking process.
  • FIG. 5 is a side view, partly in section, of the demounting device during the final phase of the bead-breaking process.
  • FIG. 6 is a front view of the second of the two bead breaking elements shown in FIGS. 1 through 5 as element 9, showing the embodiment wherein that element is fork shaped.
  • the demounting device basically comprises a pair of pincers 1 terminating in two elongated lever arms 2 and 3 which are connected with each other by pivot 4.
  • a holder 5 is provided on the lower lever arm 3 preferably at right angles to the arm.
  • This holder 5 can be an elongated member of a length greater than the largest wheel diameter to be handled.
  • the holder 5 may be U-shaped when viewed in transverse cross section. Linings 6 are provided at the extremities of the holder 5 in order to increase friction between the holder 5 and the surface of the tire 23.
  • the bead-breaking elements 8 and 9 are pivoted preferably between two plates 10.
  • the pivots 11 and 12 of the bead-breaking elements 8 and 9, respectively, are at different distances from the pivot 4 of the pincers 1.
  • the bead-breaking element 8 is preferably fork shaped so that the boot 33 of the bead-breaking element 9 can reach through the two prongs 31 and 32 of said first element 8.
  • the bead-breaking element 9 may be fork shaped so that the bead-breaking element 8 can reach through the two prongs of said element 9.
  • the bead-breaking element 9 can be immovably secured to the lever 2 of the pincers 1 without presenting an impediment during the bead-breaking process.
  • the second bead-breaking element 8 has two legs, one of which has the form of a hook.
  • the second leg 37 of said element 8 is supported through the stop 14 on the lower lever 3 of the pincers 1.
  • a spring 13 preferably in the form of a leaf spring, between the upper side of the second leg 37 of said element 8 and the upper lever 2 of the pincers 1.
  • a second stop 15 is provided on the plate 10 in order to guide the bead-breaking element 9 when the pincers are open or to locate the bead-breaking elements 8 and 9 in their initial positions in accordance with the movement of pincers 1.
  • an adjustable stop 16 is fitted between the bead-breaking elements 8 and 9 and secured to either of said elements 8 and 9.
  • the bead-breaking elements 8 and 9 can be well secured in the initial position of the pincers 1 with the stops 14, 15, and 16 adjusted accordingly. Furthermore, the bead-breaking element 9 may be provided with a spring 22 which presses element 9 against the other bead-breaking element 8, even during operation of the pincers 1, thus preventing free oscillation of element 9.
  • Another holder 17 is displaceably arranged at the rear end of the lower lever 3 of the pincers 1.
  • Holder 17 is fixed to the lever 3 by suitable fastening means, for example, a screw 18.
  • Holder 17 is provided with a hook 19 which is able to pass through the bead on the flange of the tire rim 20, thus counteracting any axial and radial forces.
  • Both levers 2 and 3 of the pincers 1 can be connected with each other by the recess 21 in the holder 17 when the pincers 1 are in initial position. For this purpose the holder 17 has to be turned upwards by 180 degrees.
  • FIG. 2 which shows the initial position for demounting the tire 23 from the rim 20
  • the pincers 1 are applied to the wheel 7 such that the hooks 31, 32, and 33 of the bead-breaking elements 8 and 9 are inserted into the drop center of the rim 20 between the tire bead 24 and the disc 25 of the rim 20.
  • the pincers 1 are then moved downwards so that the holder 5 is supported on the tire 23, with the hooks of the bead-breaking elements 8 and 9 reaching down under and behind the tire bead 24.
  • the second holder 17 is then adjusted and located such that the hook 19 is supported on the other side of the rim 20.
  • the first bead-breaking element 9 moves substantially radially, but also axially, relative to the tire 23 as a result of the movement of the bearing point 12 about the pivot 4 of the pincers 1 so that consequently the hook 33 of the bead-breaking element 9 pulls the tire bead 24 inwards.
  • the second bead-breaking element 8 is pressed by the spring 13 against the tire bead 24 so that the hooks 31 and 32 of said element 8 will reach at any rate behind the tire bead 24.
  • the radial force component is counteracted in this case by the hook 19 of the holder 17 together with the fastening means 18 and/or the friction lining 6 of the holder 5.
  • the second bead-breaking element 8 pulls the tire bead over the flange 26 of the rim 20 as illustrated in FIG. 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Tyre Moulding (AREA)
  • Tires In General (AREA)
  • Automatic Assembly (AREA)
  • Cyclones (AREA)
  • Processing Of Solid Wastes (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
US06/697,229 1984-02-04 1985-02-01 Tire-demounting device Expired - Fee Related US4588011A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3403971A DE3403971A1 (de) 1984-02-04 1984-02-04 Demontiereinrichtung fuer reifen
DE3403971 1984-02-04

Publications (1)

Publication Number Publication Date
US4588011A true US4588011A (en) 1986-05-13

Family

ID=6226821

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/697,229 Expired - Fee Related US4588011A (en) 1984-02-04 1985-02-01 Tire-demounting device

Country Status (4)

Country Link
US (1) US4588011A (en(2012))
EP (1) EP0151303A3 (en(2012))
JP (1) JPS60179310A (en(2012))
DE (1) DE3403971A1 (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890661A (en) * 1987-08-07 1990-01-02 Hofmann Werkstatt-Technik Gmbh Tire demounting tool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3524664A1 (de) * 1985-07-10 1987-01-22 Hofmann Werkstatt Technik Demontiervorrichtung fuer einen an einer radfelge befestigten reifen
EP0214323B1 (de) * 1985-09-04 1991-06-05 Schenck Auto-Service-Geräte GmbH Verfahren zur Montage oder Demontage eines Fahrzeugluftreifens sowie Vorrichtung zur Durchführung des Verfahrens
DE8711330U1 (de) * 1987-08-20 1987-10-01 Weilnhammer Maschinenbau GmbH, 8250 Dorfen Vorrichtung zur Demontage mindestens eines Reifens
CN108162701B (zh) * 2018-01-06 2019-12-27 蔡荷 一种轮胎快速拆卸装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198362A (en) * 1962-10-12 1965-08-03 Harold I Berg Lifting tool
US3693692A (en) * 1970-12-23 1972-09-26 Branick Charles E Tire bead breaking tool
US4462451A (en) * 1981-04-20 1984-07-31 Motor Wheel Corporation Method and apparatus for removing tires from rims

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563987A (en) * 1946-12-20 1951-08-14 Kent A Hill Tool for separating the bead of a tire from a rim flange
US2915283A (en) * 1954-06-17 1959-12-01 Steelman Products Corp Tire spreading tools
DE1755315A1 (de) * 1968-04-25 1971-11-11 Ernst Schmidt Vorrichtung zum Loesen von Auto- und Traktorreifen von Radfelgen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198362A (en) * 1962-10-12 1965-08-03 Harold I Berg Lifting tool
US3693692A (en) * 1970-12-23 1972-09-26 Branick Charles E Tire bead breaking tool
US4462451A (en) * 1981-04-20 1984-07-31 Motor Wheel Corporation Method and apparatus for removing tires from rims

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890661A (en) * 1987-08-07 1990-01-02 Hofmann Werkstatt-Technik Gmbh Tire demounting tool

Also Published As

Publication number Publication date
EP0151303A2 (de) 1985-08-14
EP0151303A3 (de) 1987-02-25
DE3403971C2 (en(2012)) 1987-06-04
DE3403971A1 (de) 1985-11-14
JPS60179310A (ja) 1985-09-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: GEBR. HOFMANN GMBH, CO. KG, MASCHINENFABRIK WERNER

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GOEBEL, EICKHART;REEL/FRAME:004365/0600

Effective date: 19850123

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19940515

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362